In every block there is a granny who is ready to show a civil conscience and notify the police about everything that she heard, saw and knows. The servants of the law look at such old women condescendingly, do not believe a single word of theirs and try to get rid of them as soon as possible. This is exactly the main character of the story - old Mrs. Louise Alexandra Wilberforce.
Alec Guinness plays "Professor Marcus" - a shameless and cunning criminal who puts together a gang to rob a collector's car. He settles with Mrs. Wilberforce, under the guise of a string ensemble of amateur musicians brings his friends to her and begins to weave a multi-step intrigue in which there will be a place for an unsuspecting, naive granny.
When the old woman begins to compare the facts, seducers and heartthrobs rip off the masks that interfere with them. But the old woman, as if using the teachings of Lao Tzu, so skillfully applies the principle of not doing anything that the criminals are dizzy.
Intrigue in the interiors of naive, sleepy England is always good. But the main advantage of the film is not so much the plot as a wonderful cast, in which Alec Guinness does not look like the brightest star.
After watching the film, the idea of the Coen brothers to remake The Ladykillers in 2004 becomes even less clear. In the field of black English humor, the Coens suffered a crushing defeat.